Dietary counseling based on the food pyramid concept and the food to target concept will be quite useful in the management of the disease.
The optimal age for discontinuing the diet is not known. Phenylalanine restriction is recommended during pregnancy of the phenylketonuric woman. It will be better if these women restrict the diet at the time of conception, in order to prevent the risk of mental retardation, microcephaly and congenital heart disease in infants.